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管子焊接端头收口
Closing up welded end of pipes
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铝及铝合金焊接技术条件
Technical requirements for welding of aluminium and aluminium alloy
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三十万千瓦压水堆核电厂 超低碳Cr-Ni奥氏体不锈钢堆焊材料技术条件
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钢熔化焊角焊缝射线照相方法和质量分级
Methods of radiographic testing and classification of measuring results for fillet fusion welded in steel
价格：￥0.00
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